It's not a single, but a song released as part of an album preview.

Katy Perry has released the thumping track Dark Horse, the second song revealed prior to the Oct. 22 release date of her upcoming album, Prism.

The pop star tweeted out a link early Tuesday morning for fans to download the song, which features rapper Juicy J, by preordering Prism on iTunes. The beat-heavy track is not a yes-I-can anthem like Roar, but still fits into Perry's wheelhouse, settling comfortably somewhere next to E.T.

The song isn't an official single, but rather was voted by fans as the song they wanted to hear next.